It is unfortunate that in our society women are blamed for producing female children and have been ostracised and ill-treated because:
1. | The sex is determined by the type of sperm fertilizing the egg |
2. | The sex is determined by the type of egg fertilizing the sperm |
3. | The sex is determined by the hormones produced by the fetus |
4. | The sex is determined by God’s Will |
The units of inheritance according to Mendel were ‘factors’. Today these factors are known as:
1. | Gametes | 2. | DNA |
3. | Genes | 4. | RNA |
In the case of co-dominance, the F1 generation resembles:
1. | Dominant parent | 2. | Recessive parent |
3. | Both the parents | 4. | None of the parents |
The point mutation in sickle cell anaemia leads to a change in the codon. Identify the correct change:
1. | UGA to UAA | 2. | GUG to GAG |
3. | GAG to GUG | 4. | UAA to UGA |
Genes that code for a pair of contrasting traits or slightly different forms of the same gene are known as:
1. | Alleles | 2. | Loci |
3. | Cistrons | 4. | Introns |
The two alleles of a gene pair are located on:
1. | The same chromosome. |
2. | Different chromosomes. |
3. | Homologous sites on homologous chromosomes. |
4. | Homologous sites on heterologous chromosomes. |
Morgan, in his experiment on fruit flies, found that the genes white and yellow were very tightly linked and showed:
1. | 50 % recombination | 2. | 37.2 % recombination |
3. | 12.5 % recombination | 4. | 1.3 % recombination |
What is the mode of inheritance of phenylketonuria?
1. | Autosomal recessive | 2. | Autosomal dominant |
3. | Sex linked recessive | 4. | Sex linked dominant |
Which of the following is not a feature of Down’s Syndrome?
1. | It is caused by a non-disjunction in an autosome. |
2. | The affected individual has a trisomy of chromosome 21. |
3. | The affected individual has a characteristic simian palmar crease. |
4. | The mental development of the affected individual is normal. |
Pedigree analysis is used for genetic analysis in humans rather than conventional genetic methods because:
I: | Choice matings are not possible. |
II: | The number of progeny is limited. |
Of the two statements:
1. | Only I is correct | 2. | Only II is correct |
3. | Both I and II are correct | 4. | Both I and II are incorrect |